redirect removed file from cl:
https://critique.corp.google.com/#review/121079434

Change-Id: I5629c3142167e79875d930a272977c4f527203e6
diff --git a/docs/html/_redirects.yaml b/docs/html/_redirects.yaml
index 30f8ce4..bacb4ba 100644
--- a/docs/html/_redirects.yaml
+++ b/docs/html/_redirects.yaml
@@ -898,6 +898,8 @@
   to: /studio/tools/debugging/improving-w-lint.html
 - from: /tools/debugging/index.html
   to: /studio/tools/debugging/debugging-studio.html
+- from: /tools/help/project-mgmt.html
+  to: /studio/tools/projects/index.html
 
 # Handle the rest of the tool pages that moved into /studio
 - from: /tools/...